linux-kernel - Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu")]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <5733354F.6080703@intel.com>
Date:	Wed, 11 May 2016 15:36:15 +0200
From:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-arch@...r.kernel.org,
	Rik van Riel <riel@...hat.com>,
	"Srivatsa S. Bhat" <srivatsa@....edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org,
	rui.zhang@...el.com, len.brown@...el.com,
	Linux PM <linux-pm@...r.kernel.org>
Subject: Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online
 calls to hotplugged cpu")]

On 5/11/2016 2:21 PM, Ville Syrjälä wrote:
> On Wed, May 11, 2016 at 02:11:29PM +0200, Sebastian Andrzej Siewior wrote:
>> On 05/11/2016 12:19 PM, Ville Syrjälä wrote:
>>> Hi,
>> Hi,
>>
>>> I have a Lenovo Ideapad S10-3t machine here (Atom N450, 1 core, 2 HT)
>>> which fails to resume from S3 on 4.6-rc releases. I bisected it down to
>>>
>>> commit 1cf4f629d9d246519a1e76c021806f2a51ddba4d
>>> Author: Thomas Gleixner <tglx@...utronix.de>
>>> Date:   Fri Feb 26 18:43:39 2016 +0000
>>>
>>>      cpu/hotplug: Move online calls to hotplugged cpu
>>>
>>> Unfortunately that won't revert cleanly, and neither does the merge
>>> commit, so I was unable to see if that is the only problematic commit
>>> in 4.6.
>>>
>>> Any ideas?
>> do you have a backtrace or anything or is it just not working and you
>> end up with a blank screen?
> Yeah can't get anything from the machine at that point. netconsole
> didn't help either, and no serial on this machine. And IIRC I've
> tried ramoops on this thing in the past but unfortunately the memory
> got cleared on reboot.
>

Please try

# echo processors > /sys/power/pm_test

and then suspend (it should simulate a suspend, wait for approx. 5 sec 
and then resume, see
Documentation/power/basic_pm_debugging.txt for details).  See if that 
works or if you can get any
traces etc.

Thanks,
Rafael